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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        console.log(Number.isNaN(NaN)); //true 
        console.log(Number.isNaN('wwww' / 12)); //true
        console.log(Number.isNaN(0)); //false
        console.log(Number.isNaN('hello')); //false
        console.log(Number.isNaN('hahahaa')); //false
        console.log(Number.isNaN(1254)); //false
        console.log(Number.isNaN(null)); //false
        console.log(Number.isNaN(undefined)); //false

        console.log(1 ** 2); //1
        console.log(2 ** 3); //8
        console.log(5 ** 2); //25
        console.log(5 ** 5); //3125
        console.log(12 ** 56);
    </script>
</body>

</html>